Question

**Please use MIPS assembly language**

int strlen(char* str): Parameter str is passed in a register. Assume that str points to a nulterminated string. Returns the length of the string in a register

Answer 1

Solution: The MIPS code for returning the length of string in a register is given below:

.text
main:
li $t0, 0 # Here we are initializing the  loop-counter
la $a0, message #load the address of the 1st byte

loop:
lb $t1, ($a0) # load the content of the address stored in $a0
beq $t1, $zero, exit   
# exit the program if $t0 == null

addi $t0, $t0, 1 # increment the loop counter
addi $a0, $a0, 1

j loop

exit:
move $a0, $t0 # prepare to print the integer
li $v0, 1 # integer syscall
syscall

li $v0, 10
syscall